CN107517008B - Three-phase AC-AC converter and its control method for radio energy transmission system - Google Patents
Three-phase AC-AC converter and its control method for radio energy transmission system Download PDFInfo
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- CN107517008B CN107517008B CN201710712029.6A CN201710712029A CN107517008B CN 107517008 B CN107517008 B CN 107517008B CN 201710712029 A CN201710712029 A CN 201710712029A CN 107517008 B CN107517008 B CN 107517008B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/297—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal for conversion of frequency
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention provides a kind of three-phase AC-AC converter and its control method for radio energy transmission system, converter includes six groups of anti-series IGBT switching tubes and a LC series resonant tank, in which: a phase power connection: through switching tube group S1It is connect afterwards with the capacitance terminal of LC series resonant tank, while through switching tube group S6It is connect afterwards with the inductance end of LC series resonant tank；B phase power connection: through switching tube group S2It is connect afterwards with the capacitance terminal of LC series resonant tank, while through switching tube group S5It is connect afterwards with the inductance end of LC series resonant tank；C phase power connection: through switching tube group S3It is connect afterwards with the capacitance terminal of LC series resonant tank, while through switching tube group S4It is connect afterwards with the inductance end of LC series resonant tank.Its effect is: structure is simple, volume weight is small, high-efficient.
Description
Technical field
The present invention relates to power supply control technologies, and in particular to a kind of three-phase AC-AC change for radio energy transmission system
Parallel operation and its control method.
Background technique
Wireless power transmission technology (Wireless Power Transmission, WPT) is as a kind of novel power supply skill
Art constructs the energy channel between supply side and load-side by high frequency magnetic field, and it is high-power to have filled power supply etc. in electric car
It promotes and comes in.In current high-power wireless electric energy transmission technology scheme, in order to guarantee the stability of system and reliable
Property, current constant control scheme is generally used in primary side.At present three phase mains is rectified to obtain direct current using more method,
DC chopper circuit is recycled to complete the exciting current closed-loop control to coupling mechanism to reach constant current effect.But these links
The cost for increasing system considerably increases the volume and loss of system, reduces the efficiency and stability of primary side system.
Summary of the invention
For the defect for solving existing technology, the present invention proposes a kind of three-phase AC-AC for radio energy transmission system
Low frequency three-phase electricity is directly transformed into single-phase high frequency electricity by converter and its control method, the converter, eliminates three phase rectifier electricity
Road and DC chopper circuit, simplify circuit link, and reduction system space greatly reduces the energy loss of supply side, mentions
Rise system whole efficiency.
In order to solve the above technical problems, the application is achieved using following technical scheme:
Firstly, the present invention proposes a kind of three-phase AC-AC converter for radio energy transmission system, key is:
Including six groups of anti-series IGBT switching tubes and a LC series resonant tank, in which:
A phase power connection: pass through first group of anti-series IGBT switching tube S1Connect afterwards with the capacitance terminal of LC series resonant tank
It connects, while passing through the 6th group of anti-series IGBT switching tube S6It is connect afterwards with the inductance end of LC series resonant tank；
B phase power connection: pass through second group of anti-series IGBT switching tube S2Connect afterwards with the capacitance terminal of LC series resonant tank
It connects, while passing through the 5th group of anti-series IGBT switching tube S5It is connect afterwards with the inductance end of LC series resonant tank；
C phase power connection: pass through third group anti-series IGBT switching tube S3Connect afterwards with the capacitance terminal of LC series resonant tank
It connects, while passing through the 4th group of anti-series IGBT switching tube S4It is connect afterwards with the inductance end of LC series resonant tank.
Under normal circumstances, radio energy transmission system carries out three phase mains to give coupling mechanism high frequency pumping electric current
Rectification obtains direct current, then voltage magnitude is adjusted by DC chopped-wave, needed for obtaining finally by high-frequency inverter circuit
Electric current.But in this mode, due to characteristics such as device internal resistances, there are inevitable conduction losses for rectifier diode, block
There is very big electric energy loss on energy storage inductor and freewheeling diode in DC chopper circuit, result in the confession of supply side in loss etc.
Electrical efficiency decline.While the stabilization in order to guarantee voltage, addition energy storage is generally required after rectification circuit and DC chopper circuit
Capacitor, this also considerably increases the volume of system, since the link that supply side uses is more, also causes to control complexity rising.
The present invention utilizes three-phase full-bridge inverting circuit, single-phase carry out inversion is successively controlled according to phase relation, to reach
Output frequency is adjustable, the alternating current of amplitude stability.Since the electric energy loss of switching tube is far smaller than diode and energy storage electricity
Loss brought by sense, therefore the electric energy loss of system power supply side can be greatly reduced, while reducing system bulk, structure letter
It is single, there is apparent advantage relative to traditional approach.
Further, six groups of anti-series IGBT switching tubes control its switch state by controller, on the controller
It is provided with the current detector for detecting resonance current and the voltage detector for detecting three-phase electricity phase voltage.
Further, the inductance in the LC series resonant tank is the primary side emission lines in radio energy transmission system
Circle.
Further, anti-paralleled diode is provided on the IGBT switching tube.
Further, the controller controls six groups of anti-series IGBT switching tubes according to following 7 kinds of modes:
Wherein: Sofe Switch driving signal is given in SS expression；The inversion signal of Sofe Switch driving signal is given in NS expression, for
For mode 1, indicate in condition | IP| < Iref,uab> 0, ucaIn the case where=0, switch tube group (S1,S5) give Sofe Switch
Driving signal, switch tube group (S2,S6) give the inversion signal of Sofe Switch driving signal, and switching tube group (S3,S4) be in
Off-state, remaining and so on；For mode 7, indicate in condition | IP|≥IrefIn the case where, switching tube group (S3,
S4) in the conductive state, rest switch pipe group is in an off state, wherein IPIndicate that the resonance current peak value in primary coil is big
It is small, IrefIndicate the reference current size of setting, uab,ubc,ucaRespectively indicate the mutual phase voltage of a, b, c three-phase electricity.
It is designed based on foregoing circuit structure, the present invention also proposes a kind of three-phase AC-AC for radio energy transmission system
The control method of converter, mainly comprises the steps that
S1: detection circuit parameter, including the resonance current and the mutual phase voltage of three-phase electricity in primary coil；
S2: judge the resonance current peak I in primary coilPWhether reference current I is less thanref, if it is, into S3,
Otherwise it is controlled using mode 7；
S3: judge the phase voltage u between a, b two-phase power supplyabWhether zero crossing arrives, if arrive, into S4, otherwise into
Enter S5；
S4: judge the phase voltage u between b, c two-phase power supplybcWhether it is positive, if it is, being controlled using mode 5；
Otherwise, it is controlled using mode 6；
S5: judge the phase voltage u between b, c two-phase power supplybcWhether zero crossing arrives, if arrive, into S6, otherwise into
Enter S7；
S6: judge the phase voltage u between c, a two-phase power supplycaWhether it is positive, if it is, being controlled using mode 3；
Otherwise, it is controlled using mode 4；
S7: judge the phase voltage u between c, a two-phase power supplycaWhether zero crossing arrives, if arrived, into S8, otherwise returns
Return S1；
S8: judge the phase voltage u between a, b two-phase power supplyabWhether it is positive, if it is, being controlled using mode 1；
Otherwise, it is controlled using mode 2.
Compared with prior art, technical solution provided by the present application, the technical effect or advantage having are:
(1) structure is simple, and the module of Main change of the present invention is switching tube, constitutes one group using two inverse parallel IGBT and opens
Shutting mechanism eliminates traditional rectification circuit and DC chopper circuit, keeps the structure of system simpler.
(2) volume weight is small, the present invention due to eliminate the capacitor in traditional rectification circuit and DC chopper circuit and
Inductance greatly reduces the volume and weight of system.
(3) high-efficient, the present invention is main to be lost the switching loss for being IGBT, due to using soft switch technique, opens
Close the loss very little of pipe.And traditional circuit is not only lossy on switching tube, but also presence can not be eliminated on inductance and diode
A large amount of losses.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention；
Fig. 2 is switching tube drive waveforms figure；
Fig. 3 is the circuit connection state figure in the first control period in specific embodiment；
Fig. 4 is the circuit connection state figure in the second control period in specific embodiment；
Fig. 5 is the circuit connection state figure that third controls the period in specific embodiment；
Fig. 6 is control flow chart of the invention.
Specific embodiment
The embodiment of the present application is a kind of for the three-phase AC-AC converter of radio energy transmission system and its control by providing
Method, complicated for improving existing three-phase AC-AC transform part, space is huge, the relatively low defect of efficiency.Existing three intersection is handed over
Frequency changer circuit is the convertor circuit for the alternating current of mains frequency being directly converted to the alternating current of adjustable frequency, is mainly used in big
Power alternating current machine speed-regulating system, under normal circumstances, output upper limiting frequency are not higher than the 1/3~1/2 of mains frequency.And it is of the invention
It is the alternating current circuit that the alternating current of mains frequency is directly transformed to the alternating current of high frequency, output frequency is generally mains frequency
300 times or more, to generate the excitation field of high frequency, it can be applied to high-power wireless electric energy transmission system.
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments, it is right
Above-mentioned technical proposal is described in detail.
Embodiment
As shown in Figure 1, a kind of three-phase AC-AC converter for radio energy transmission system, including six groups of anti-series
IGBT switching tube and a LC series resonant tank, in which:
A phase power connection: through switching tube group S1It is connect afterwards with the capacitance terminal of LC series resonant tank, while through switching tube group
S6It is connect afterwards with the inductance end of LC series resonant tank；
B phase power connection: pass through second group of anti-series IGBT switching tube S2Connect afterwards with the capacitance terminal of LC series resonant tank
It connects, while passing through the 5th group of anti-series IGBT switching tube S5It is connect afterwards with the inductance end of LC series resonant tank；
C phase power connection: pass through third group anti-series IGBT switching tube S3Connect afterwards with the capacitance terminal of LC series resonant tank
It connects, while passing through the 4th group of anti-series IGBT switching tube S4It is connect afterwards with the inductance end of LC series resonant tank.
As radio energy transmission system in application, inductance in LC series resonant tank is radio energy transmission system
In primary side transmitting coil.
Based on above-mentioned design it can be found that the present invention constitutes three-phase AC-AC transformation by six groups of anti-series IGBT switching tubes
Circuit, it is simple relative to conventional wireless electric energy transmission system structure, reduce system link significantly.Three-phase AC-AC translation circuit
Switching tube switching can be carried out by detection three-phase item voltage over zero, so that the voltage of input side be made to keep relative stability.By
It is significantly larger than three-phase electric frequency in the working frequency of translation circuit, the input voltage of circuit is considered as constant within the monocycle,
Thus inversion goes out stable high frequency alternating current.Two circuit functions may be implemented in the circuit, first is that converting list for three-phase electricity
Mutually electricity, and raising frequency is carried out to single-phase electricity；Second is that can control the amplitude of rail currents.
In the specific implementation, six groups of anti-series IGBT switching tubes control its switch state by controller, the control
The current detector for detecting resonance current and the voltage detector for detecting three-phase electricity phase voltage are provided on device, together
When, anti-paralleled diode is provided on the IGBT switching tube.
In order to guarantee that the power and efficiency of system, the controller open six groups of anti-series IGBT according to following 7 kinds of modes
Pipe is closed to be controlled:
Wherein: Sofe Switch driving signal is given in SS expression；The inversion signal of Sofe Switch driving signal is given in NS expression, for
For mode 1, indicate in condition | IP| < Iref,uab> 0, ucaIn the case where=0, switch tube group (S1,S5) give Sofe Switch
Driving signal, switch tube group (S2,S6) give the inversion signal of Sofe Switch driving signal, and switching tube group (S3,S4) be in
Off-state, remaining and so on；For mode 7, indicate in condition | IP|≥IrefIn the case where, switching tube group (S3,
S4) in the conductive state, rest switch pipe group is in an off state, wherein IPIndicate that the resonance current peak value in primary coil is big
It is small, IrefIndicate the reference current size of setting, uab,ubc,ucaRespectively indicate the mutual phase voltage of a, b, c three-phase electricity.
Based on above-mentioned design it can be found that the Rule of judgment of mode there are 3, it is respectively as follows:
(1) size relation between coil current and setting electric current；
(2) positive and negative values of three-phase electricity phase voltage；
(3) zero crossing of three-phase electricity phase voltage；
At any one moment, input of the phase of maximum absolute value in three-phase electricity as system is chosen, it is possible thereby to
Unobvious and sufficiently large amplitude voltage input is fluctuated to a voltage value, to guarantee that system has steady and sufficient input work
Rate.Figure it is seen that switching point between phase and phase is exactly the voltage zero-cross electricity of third phase.Therefore pass through the mistake of phase voltage
Zero point and maximum phase voltage at this time it is positive and negative can designing system drive waveforms.Since the driving frequency of switching tube is very high,
As soon as voltage input in drive cycle can be with approximately constant, thus three-phase electricity inversion is by three-phase AC-AC translation circuit
The single-phase electricity of high-frequency stabilization.
When the electric current of coil is less than coil current setting value, according to Sofe Switch driving signal to the switching tube in circuit
It is driven, obtains high frequency alternating current.
When the electric current of coil is more than coil current setting value, S3 and S4 switching tube is opened, other switching tubes all close
It closes, thus makes primary side resonant capacitance and inductance and S3, S4 forms a circuit.Coupling mechanism loses energy injection, primary side at this time
Electric current in coil starts free concussion, while being load supplying, so that the electric current in coil be made to begin to decline.
The drive waveforms of each switching tube generated by above-mentioned rule are as shown in Fig. 2, dotted line indicates the exhausted of three-phase electricity in figure
To value, SS signal is Sofe Switch signal, and OVIP signal is that coil current is more than the signal that setting value generates, and Mode indicates control mould
Formula.
It is laggard in next zero point when detecting that electric current is more than coil current setting value in order to guarantee the efficiency of system
Row control, thus it is open-minded still to meet ZCS for system.
By taking 3 control periods preceding in Fig. 2 as an example, circuit state is analyzed.
From figure 2 it can be seen that at first control period, ubcFor the maximum phase of voltage in three-phase electricity, and at this time
ubc< 0, therefore, control model are mode 6.
According to control rule (S3,S5),SS,(S2,S4), NS, S3 and S5 gives SS driving signal and closes at this time, S2 and
S4 gives NS driving signal and opens.Therefore LC resonance circuit, b phase power supply and c phase power supply and switching tube S4, S2 constitute one
Circuit, circuit state are as shown in Figure 3.
Second control period, control model is still mode 6, but since coil current is reversed, according to control rule
For (S3,S5),SS,(S2,S4), NS, S3 and S5 gives SS driving signal and opens at this time, and S2 and S4 give NS driving signal i.e.
It closes.Therefore coupling mechanism, power supply b phase and c phase and switching tube S3, S5 constitute a circuit, and circuit state is as shown in Figure 4.
And detect that coil current has been above current setting value, OVIP=1 at this time.
The period is controlled in third, having been detected by coil current due to a upper control period is more than current setting value,
Therefore enter control model 7.Switching tube S3 is opened at this time, S4 and closes other switching tubes, therefore coupling mechanism and switching tube
S3, S4 constitute a discharge loop, decline coil current, thus reach the function of control coil size of current, corresponding electricity
Line state is as shown in Figure 5.
Based on foregoing description, a kind of available control of the three-phase AC-AC converter for radio energy transmission system
Method, detailed process are as shown in Figure 6, comprising the following steps:
S1: detection circuit parameter, including the resonance current and the mutual phase voltage of three-phase electricity in primary coil；
S2: judge the resonance current peak I in primary coilPWhether reference current I is less thanref, if it is, into S3,
Otherwise it is controlled using mode 7；
S3: judge the phase voltage u between a, b two-phase power supplyabWhether zero crossing arrives, if arrive, into S4, otherwise into
Enter S5；
S4: judge the phase voltage u between b, c two-phase power supplybcWhether it is positive, if it is, being controlled using mode 5；
Otherwise, it is controlled using mode 6；
S5: judge the phase voltage u between b, c two-phase power supplybcWhether zero crossing arrives, if arrive, into S6, otherwise into
Enter S7；
S6: judge the phase voltage u between c, a two-phase power supplycaWhether it is positive, if it is, being controlled using mode 3；
Otherwise, it is controlled using mode 4；
S7: judge the phase voltage u between c, a two-phase power supplycaWhether zero crossing arrives, if arrived, into S8, otherwise returns
Return S1；
S8: judge the phase voltage u between a, b two-phase power supplyabWhether it is positive, if it is, being controlled using mode 1；
Otherwise, it is controlled using mode 2.
Wherein, mode 1,27 described in the text corresponds to system control model shown in table, controls at one
Period starts to detect circuit system parameter, and according to control model needed for the selection of rule shown in upper table.
Based on above-mentioned analysis it is appreciated that high-frequency inversion, constant current may be implemented in three-phase AC-AC converter proposed by the present invention
Control can constitute free oscillation circuit using primary side resonant tank and switching tube and realize the big minor adjustment of coil current, circuit structure
Overall simple, the easy switching between various modes, while reducing circuit link, moreover it is possible to greatly improve control efficiency, energy
Enough it is effectively applied in radio energy transmission system.
Finally it is pointed out that the above description is not a limitation of the present invention, and the present invention is also not limited to above-mentioned
Citing, variation that those skilled in the art are made within the essential scope of the present invention, are added or are replaced modification
It changes, also should belong to protection scope of the present invention.
Claims (4)
1. a kind of three-phase AC-AC converter for radio energy transmission system, it is characterised in that: including six groups of anti-series IGBT
Switching tube and a LC series resonant tank, in which:
A phase power connection: through first group of anti-series IGBT switching tube S1It is connect afterwards with the capacitance terminal of LC series resonant tank, simultaneously
Through the 6th group of anti-series IGBT switching tube S6It is connect afterwards with the inductance end of LC series resonant tank；
B phase power connection: pass through second group of anti-series IGBT switching tube S2It is connect afterwards with the capacitance terminal of LC series resonant tank, together
When pass through the 5th group of anti-series IGBT switching tube S5It is connect afterwards with the inductance end of LC series resonant tank；
C phase power connection: pass through third group anti-series IGBT switching tube S3It is connect afterwards with the capacitance terminal of LC series resonant tank, together
When pass through the 4th group of anti-series IGBT switching tube S4It is connect afterwards with the inductance end of LC series resonant tank；
Six groups of anti-series IGBT switching tubes control its switch state by controller, are provided on the controller for detecting
The current detector of resonance current and voltage detector for detecting three-phase electricity phase voltage；
The controller controls six groups of anti-series IGBT switching tubes according to following 7 kinds of modes:
Wherein: Sofe Switch driving signal is given in SS expression；NS indicates to give the inversion signal of Sofe Switch driving signal, for mode
For 1, indicate in condition | IP| < Iref,uab> 0, ucaIn the case where=0, switch tube group S1,S5Give Sofe Switch driving letter
Number, switch tube group S2,S6Give the inversion signal of Sofe Switch driving signal, and switching tube group S3,S4It is in an off state,
Remaining and so on；For mode 7, indicate in condition | IP|≥IrefIn the case where, switching tube group S3,S4It is on shape
State, rest switch pipe group are in an off state, wherein IPIndicate the resonance current peak value size in primary coil, IrefExpression is set
Fixed reference current size, uab,ubc,ucaRespectively indicate the mutual phase voltage of a, b, c three-phase electricity.
2. the three-phase AC-AC converter according to claim 1 for radio energy transmission system, it is characterised in that: institute
Stating the inductance in LC series resonant tank is the primary side transmitting coil in radio energy transmission system.
3. the three-phase AC-AC converter according to claim 1 for radio energy transmission system, it is characterised in that:
Anti-paralleled diode is provided on the IGBT switching tube.
4. the control method for the three-phase AC-AC converter of radio energy transmission system as described in claim 1, feature
Be the following steps are included:
S1: detection circuit parameter, including the resonance current and the mutual phase voltage of three-phase electricity in primary coil；
S2: judge the resonance current peak I in primary coilPWhether reference current I is less thanref, if it is, into S3, otherwise
It is controlled using mode 7；
S3: judge the phase voltage u between a, b two-phase power supplyabWhether zero crossing arrives, if arrived, into S4, otherwise enters
S5；
S4: judge the phase voltage u between b, c two-phase power supplybcWhether it is positive, if it is, being controlled using mode 5；Otherwise,
It is controlled using mode 6；
S5: judge the phase voltage u between b, c two-phase power supplybcWhether zero crossing arrives, if arrived, into S6, otherwise enters
S7；
S6: judge the phase voltage u between c, a two-phase power supplycaWhether it is positive, if it is, being controlled using mode 3；Otherwise,
It is controlled using mode 4；
S7: judge the phase voltage u between c, a two-phase power supplycaWhether zero crossing arrives, if arrived, into S8, otherwise returns
S1；
S8: judge the phase voltage u between a, b two-phase power supplyabWhether it is positive, if it is, being controlled using mode 1；Otherwise,
It is controlled using mode 2.
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| CN101540545A (en) * | 2009-04-28 | 2009-09-23 | 大连理工大学 | Non-contact electric energy transmission system based on single-phase matrix convertor |
| US8779745B2 (en) * | 2010-03-01 | 2014-07-15 | National Semiconductor Corporation | Three-quarter bridge power converters for wireless power transfer applications and other applications |
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